1D Element Creation in HyperMesh

Ques:1 mesh the given component with the size of 5 units.

Ans: Steps:

1. Import the model first.
2. Go to Geom from main menu page.
3. Select midsurface from main menu bar.
4. Do surface extraction as this model has uniform thickness throughout so, shell mesh will be best.
5. Select both solids and click on extract.
6. It will look like this.
7. Go to tools and select delete, to delete the solid bodies/components.
8. click on components on screen and click on delete.
9. It will look like this.
10. Now create a new component for individual bodies or components displayed on screen and move them in it because both the surface extracted are in single component which is not preferable.
11. To create a new component, right click on model in tab bar.
12. Select component.
13. A new component will be added, rename it as “bracket 2” and rename the first generated mid surface component as “bracket 1”.
14. To do renaming of any component, just right click on the component in tab bar and select rename.
15. Now move second component into bracket 2.
16. To do so go to tools in main menu page and select “organize”

17. Select surfs and select the surface on the screen to move the surface to bracket 2 component.
18. Before that make sure to select “dest component” as bracket 2, as it indicates your destination component.
19. Click on move and the surface will be moved to bracket 2 components.
20. Now let’s do 2D meshing of element size 5 units.
21. Before that do washer split at each and every hole.
22. For that go to any main menu page and select “quick edit”
23. Select washer split and give offset value as 5.
24. Select all the edges of the holes, and the washer split is created.
25. Click on return, go to “2D main menu page”, select automesh in it.
26. Set element size as 5 units and mesh type as quads.
27. Select all surfaces on screen and click mesh.
28. Increase or decrease number of nodes at washer area and set it to equal to each other. And click mesh again.
29. To capture geometry with elements at filleted areas, split the surface with lines at fillets.

(areas shown in images).

30. To do so, go to geom main menu page click on line.
31. Select linear nodes, select nodes of elements on screen and click on create.
32. Do the same for every filleted area.
33. Split the surface with these lines by using surface edit tool.
34. Select surfs and free lines on screen and click on trim.
35. Now again mesh the surfaces and increase number of nodes at fillet area to properly capture the surface with elements.

Ques: 2 creating 1D rod element with RBE2 element and with translational DOF constrained.

Ans: Steps:

1. Go to 1D main menu page and select rigids.

2. Deselect Dof4, dof5 and dof6.
3. Change selections for nodes to multiple nodes and nodes to calculate nodes.
4. Select nodes like this and click on create.
5. A cluster of RBE2 elements will be created, also called as RBE2 link.
6. Do the same on bracket 2. (grey component name is bracket 1 and cyan coloured component name is bracket 2)
7. Select rods in 1d main menu page to create a rod element.
8. Select element type as CROD.
9. Select nodes as shown in pic, in the centre of pinhole.
10. Create a property by right clicking in tab bar, select property, in that select PROD, as we are defining a rod element right now.
11. Rename property1 as Rod.
12. Right now we cant assign the rod property to the rod as we didn’t define rod’s section.
13. So create a rod section go to hyperbeam in 1D main menu page.
14. After selecting hyperbeam, this option will be displayed on screen.
15. In this select “standard section”
16. in standard section library, select “optistruct”.
17. In standard section type, select “box”, then click on create.
18. After clicking on create, this window will open and here, define the cross sectional dimensions in parameter definition.
19. Here type DIM1=12, DIM2=10 and Thickness DIM3 and DIM4 as 0.75.
20. Now select “rod” in tab bar in property dropdown.
21. Now click on beam section.
22. This dialogue box will open, select the “box_section2” and click on apply and ok.

Ques:3 Beam element

Ans: steps:

Do the same process for beam element and bar element as done in question no. 2.

Just change the link type to RBE3 link and cross section as I section with given parameters.

Constraining all DOFs. For RBE3 link.

To apply beam element go to bars and select element type as CBEAM.

Creating I cross section by using hyperbeam option with specified parameters.

Assign beam property to it also.

Ques 4: Bar element

Ans: steps:

This one also follows same steps as done in question 2 with some changes.

Constrained only x and y DOFs with RBE3 link

Created a bar element.

Created a x section also known as “cross” with specified parameters.

Again create a new property as Pbar and assign cross section X to this property.

Ques:5 apply the mass of magnitude 10 with rbe2 link.

Ans: steps:

1. Create Rbe2 link at d and e pin holes (process explained in ques 2).
2. Left one is d and right one is e pin hole.
3. Now to create mass go to 1D main menu page select masses.
4. Assign mass as 10 units.
5. Select elem types as CMASS1.
6. Select node at the center of rbe2 link at d and e both.
7. Then click on create.
8. Create a property as mass and assign mass to the CMASS1 by using update option in masses and assign property as mass.
9. Do the same for both pin holes d and e.

Ques:6 Join the two components with spring elements.

Ans: Steps:

1. First create a rbe 2 links at both pin hole “f”.
2. Now create a spring element connecting “pin hole d” to “pin hole f” and “pin hole e” to “pin hole f”.
3. To do so, click on springs in 1D main menu page.
4. Here select element type as HMSPRING.
5. Select nodes as shown in pic.